Electrically-heated burnishing machine



Apr. 17, 1923. 1,451,687

H. E. DOW

ELECTRICALLY HEATEDQBURNISHING MACHINE Filed May 6, 1921 Patented Apr.17, 1923.

UNITED STATES I ELECTRICALLY-HEATED BURNISHING MACHINE.

Application filed May 6, 1921.

To all whom it may concern:

, Be it known that I, HARRY E. Dow, a citizen of the United States,residing at Beverly, in the county of Essex and State of Massachusetts,have invented certain Improvements in Electrically-Heated Burnish ingMachines, of which the following description, in connection with theaccompanying drawings, is a specification, like reference characters onthe drawings indicating like parts in the several figures.

his invention relates to electrically operatedmachines and is disclosedas embodied in a machine for burnishing the sole edges of boots andshoes, of the well-known type known as the Union edge setting machine.

Considerable difficulty has been experienced in machines havingelectrically heated moving tools in conveying the electrical energy tothe electric unit, if the unit is mounted upon or close to the movingtool as it should be for the sake of economy and heat energy, since themotion of the tool carrier soon destroys the leads used in conveying theelectricity from the fixed frame to the moving tool carrier. Theinvention of F. E. Boothroyd as described and claimed in his Patent No.1,410,053 granted Mar. 21, 1922, solved thisproblem by 3 providingcomparatively short spiral spring leads, preferably under a, state ofcompression, with their axes substantially straight extending betweenthe moving tool carrier and the fixed frame of the machine.

An important object of the present in vention is still further toimprove the construction of machines of this type by obtaining certaineconomies in construction which. will hereinafter appear.

40 The Union edge setting machine as is well known, carries a shank andforepart edge setting tool which are interchangeable at will by theoperator upon pushing back a latch which holds them in position. I

' have found it advantageous to utilize the springs which control thislatch as leads for the conduction of electric energy to a unit held inthe vibrating tool carrier.

Accordingly an important feature of the invention consists in anorganization comprising a tool holder, an electric unit on the holder, alatch and a spring acting to operate theglatch and conduct electriccurrent to the unit.

This and other features of the invention Serial No. 467,459.

comprising certain combinations and arrangements of parts will beunderstood from the following description of a preferred embodimentthereof selected for purposes of illustration and shown in theaccompanying drawings in which,

Fig. 1 is a side elevation, partly broken away;

Fig. 2 is an exploded View leads and associated elements;

Fig. 3 is a section on the line, 33 of Fig. 1.

The machine has an oscillating tool carrying head 10 oscillating aboutthe center 12 in a well-known manner. The head 10 has a forwardlypositioned extension 14 within which is mounted a slida-ble closelyfitting sleeve 16 projecting from its front end. This sleeve has twolaterally projecting lugs 18, 20, each of which has a forward extension22 extending through a slot 24 in a flange 26 forming the front end ofthe extension 1%. Mounted upon the projecting end of the extension 14and fitting against the flange 26 is a rotatable tool carrier 28carrying two edge setting tools 30 and having two notches in its rearside in which the ends of the extensions 22 latch. Pressure upon thehandle 32 mounted on the end of the sleeve 16 pushes it back carryingwith it the extensions 22 and releasing the tool carrier which can thenbe pushed around by the operator to interchange the tool after whichrelease of the handle 332 permits re-latchin into position. The sleeve16 has mounted within it an electric unit 34 fo heating the tools.Mounted upon the rear end of the sleeve 16 is a block 36 of fibre orother insulating material having two sockets 38 in its face, thesesockets havcopper terminal blocks 40 at their hot toms. Mounted upon theframe of the machine directly opposite the block 36 is a similar. block4-2 with registering sockets and copper blocks. Extending between eachpair of sockets is a spring 44 with its ends seated against the copperblocks. This spring is spiral in form with its axis substantiallystraight and is preferably under compression when, in position in orderto keep it firmly in contact with the copper blocks 40 without thenecessity of binding screws whichv would tend to overstrain and break itat the point of contact. These springs perform the double function ofof, the spring able on said holder,

thrusting the sleeve 16 forward and there by maintaining the tool holderin latched condition and communicating electric energy to the the unit84, the terminals 46 of-the 'unit being connected. to the moving pairofblocks tO'andth'e immovable pair of copper blocks 40 being connectedto the mains as indicated. 'The'springs 44, whose length is not long ascompared with their diameter, and whose axes are substantially straight,as desoribed,;are sufficiently stiff to prevent any substantial bendingunder their own weight and are not therefore thrown about looselybecause of their own inertia. It has been found that leads of this formare not subject to the fatigue and deterioration that-hasbeen'experienced with other-types of leads for conducting electricenergy to a moving part.

Having described my invention, what I claim as new and desire to secureby Letters Patent of the United States is l. In a machine of the classdescribed, a

moving tool holder, a reversible tool carrier on said-holder, a latchfor holding said carrier inoperative position, a spring extend- Iingbetween said latch and the fixed frame said unit and to a source ofelectrical energy, respectively.

3. In a machine of the class described, an oscillating tool holder, atool carrier movable on said holder, latch on said holder for holdingsaid carrier in operative position, a block positionednear'thefixedframe o'fthe machine and operatively connected with saidlatch, a corresponding blockmounted on the frame of the machine oppositethe first-named block, a spiral spring extending between said blocks tohold said latch inoperative position by pressure upon said first Inamedblockthe length of said spring notbeing more than tentimesits'diameter, and said spring being sufficiently stiff to avoidsubstantial'bendi'ng un'derits own-weight when supported at its endsbetween said blocks.

4; In a machine of the class described, an oscillating tool holder, atool carrier movable on said holder, a latch'onsaid holder for holdingsaid carrier in operativeposition', a blockpositionednear'thefixed-frame of the machine and operatively connected with saidlatch, a corresponding block mounted on the frame of the machineoppositethe first-named block, a spiral spring extending between said blocks to'hold said latch in operative position by pressure'upon saidffirst-namedblock, the length ofsaid spring not being more than ten times itsdiameter and said spring being sufficiently stiff toavoid substantialbend ing under its own Weight when supported at its ends between saidblocks, and being under compression. i

In testimony whereof I have signed my name to this specification.

HAR Y new.

